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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Inequivalence of correlation-based measures of non-Markovianity

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Author(s):
Neto, Alaor Cervati ; Karpat, Goktug ; Fanchini, Felipe Fernandes
Total Authors: 3
Document type: Journal article
Source: Physical Review A; v. 94, n. 3 SEP 6 2016.
Web of Science Citations: 8
Abstract

We conclusively show that the entanglement- and the mutual-information-based measures of quantum non-Markovianity are inequivalent. To this aim, we first analytically solve the optimization problem in the definition of the entanglement-based measure for a two-level system. We demonstrate that the optimal initial bipartite state of the open system and the ancillary is always given by one of the Bell states for any one-qubit dynamics. On top of this result, we present an explicit example dynamics where memory effects emerge according to the mutual-information-based measure, even though the time evolution remains memoryless with respect to the entanglement- based measure. Finally, we explain this disagreement between the two measures in terms of the information dynamics of the open system, exploring the accessible and inaccessible parts of information. (AU)

FAPESP's process: 08/57856-6 - National Institute of Science and Technology - Quantum Information
Grantee:Amir Ordacgi Caldeira
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/05581-7 - Quantum control in dissipative systems
Grantee:Felipe Fernandes Fanchini
Support type: Regular Research Grants
FAPESP's process: 12/18558-5 - Studying the monogamic relations between entanglement and quantum correlations
Grantee:Goktug Karpat
Support type: Scholarships in Brazil - Post-Doctorate